You want to store primitive int values in a collection and perform arithmetic operations easily. Which approach best uses wrapper classes to achieve this?

hard📝 Application Q15 of 15

Java - Wrapper Classes

AUse List<Integer> and rely on autoboxing/unboxing

BUse List<int> since it stores primitives directly

CConvert int to String before adding to collection

DUse arrays only, wrapper classes are not needed

Step-by-Step Solution

Solution:

Step 1: Understand collections and primitives
Java collections cannot store primitive types like int directly; they require objects.
Step 2: Use wrapper classes with autoboxing
List stores Integer objects. Autoboxing converts int to Integer automatically, allowing easy arithmetic with unboxing.
Final Answer:
Use List and rely on autoboxing/unboxing -> Option A
Quick Check:
Collections need wrapper classes for primitives [OK]

Quick Trick: Use List for primitives with autoboxing [OK]

Common Mistakes:

Trying to use List which is invalid
Storing primitives as Strings unnecessarily
Avoiding wrapper classes in collections

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More Java Quizzes

You want to store primitive int values in a collection and perform arithmetic operations easily. Which approach best uses wrapper classes to achieve this?

Step 1: Understand collections and primitives

Step 2: Use wrapper classes with autoboxing

Final Answer:

Quick Check:

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